No, that's something different again. In a system where you get paid regardless of if a block is found that's the pool incentivising you to stick around without using PPLNS or some other system beyond PPS. PPS is paid per share, when the block is found the reward is split based on the amount of work provided, which is why large miners could quickly switch pools and gain disproportionate rewards.
Yeah, I'm using nicehash definition of PPS, but they are a hash rental company really, not a pool, so there might be a difference.
Yeah, if a pool pays you for your shares only after a block is found, then yes, that could be abused as you described. But from memory I think pools usually credit you for your shares immediately, so in theory you could get paid in PPS without the pool finding any block.
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Yeah, that's it there - with nicehash you're selling your work to a buyer, who pays you per share. When you're on a pool directly, you need the blocks to come in
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